ASoC: tscs454: remove unused variable 'PLL_48K_RATE'

The global variable 'PLL_48K_RATE' is never used
so just remove it.
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Link: https://lore.kernel.org/r/20190808032552.45360-1-yuehaibing@huawei.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/tscs454.c

@@ -22,7 +22,6 @@
 
 #include "tscs454.h"
 
-static const unsigned int PLL_48K_RATE = (48000 * 256);
 static const unsigned int PLL_44_1K_RATE = (44100 * 256);
 
 #define COEFF_SIZE 3